Brake apparatus.



n. L. UNDQUIST & e. N. CRABBE.

BRAKE APPARATUS.

APPLICATION FILED JAN.22. 1316.

1,291,035. Patented Jan. 14, 191 9.

WITNESSES INVENTORS ,4 6M Mag m BY am u, za m.

EAVIED I1. LINIDQ'UIST, OF YONKERS, NEW YORK, AND GEORGE N. CRABBE, OF CRESSKILL, HEW JERSEY, ASSIGNORS TO OTIS ELEVATOR GOMEANZ, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

BRAKE AIE PABATUS.

recipes,

Specification of Letters Eatent.

Fatented Jan. ltd, 1919,

To all whom it may concern:

Be it known that we, DAVID L. Lrnoours'r, a subject of the King of Sweden, residing in Yonkers, in the county of lVestchester and State of New York, and Graeme N. CRABBE, a citizen of the United States, and residing in Cresskill, in the county of Bergen and State of New Jersey, have invented a new and useful Improvement in Brake Apparatus, of which the following is a specification.

Our invention relates to an improvement in brakes, wherein electric current is used for the purpose of releasing the brake. it has been found in practice that this type of brake does not release as soon as the current is applied. We have overcome this de feet by providing a magnet to release the brake, which magnet has two windings, one the ordinary winding for that purpose, and a second winding which is in the main circuit to the motor. The full power or the mainmotor circuit is thus available in life ing the brake, which will insure the quick release or lii't oi the brake, which is the desired result,

We have shown our device applied to an electric elevator system, but it is to be understood that this application is merely illustrative, as the device may be used in other electrically driven apparatus.

Referringto the accompanymg drawing,

an elevator car, E, is shown, a motor, for driving the same, and a brake, B.- Reversing switches, R and S, are provided to control the direction of travel of the car, these switches being controlled by magnets, l and 2, which are controlled from the car by a switch, Q the magnet, 1, controlling the reversing switch R and magnet 2 controlling the reversing switch, S, Movement of the lever of the switch, C, in the car to the left, closes a circuit to the winding of the magnet, 1, which is thereby energized and lifts its core to close the reversin switch, B. Gurrent will then flow from t e plus side of the line through the reversing switch, B, through the motor, M, and out through the winding,

operates to release t e brake, B, through the member, 9, carried by the core of a magnet, 8, and to the minus side of the line. At the same'time, the winding, 5, which is alsoa winding of the magnet, 4:, is energized by reason of one end being connected to the minus side of the main circuit of the motor, and the other end being connected to the reversing switch, it, by an auxiliary contact, 10, By reason of both brake magnet windings acting together, the brake is sure to lift quickly. When the brake is lifted, a pair of contacts 7 will be closed, one contact being stationary, and the other carried by the upper end of the core of the magnet, 4, the lower end of which core is connected to the brake The closure of these contacts 7 closes a circuit to the winding of the magnet 8, one end of which winding is connected to the auxiliary contact 10in the circuit to the winding, 5, and the other end being connected in the minus side oi the circuit for the magnet 1. Upon the magnet, 8, being energized, it lifts its core to which is secured the member, 9. W hen the member 9 is lifted by movement of the core of the magnet, 8, it carries with it a contact 11, into; engagement with a stationary contact 12 connected to the main circuit or" the motor. The efiect of this action will be first to short circuit the winding 6, and then open circuit it, 'The winding 5, however, remains energized to hold the brake ed.

The operation of the brake when the lever in the car is moved to the right instead or to the left, is the same as just described, the magnets e and 8 being connected, of course, to the reversing switch S as well as to the reversing switch R. A description of this operation is therefore unnecessary.

We desire not to be limited to the precise details of construction here shown, as others skilled in'the art might make changes therein without departing from the spirit and scope of our invention.

What we claim is l. in brake controlling apparatus for elevators, the combination with the hoisting motor, a brake therefor comprising a double wound brake magnet, a source of current supply, a motor circult including one of the said brake windings in serles therew1th, a

6, of'the magnet, ilthe armature of which i circuit in shunt to the sald motor circuit, in-

cluding the other of the sald brake windings, a switch in both the motor and shunt clrcuits to connect the said circuits to and dlsconnect them from the source of current supply, and electric means to short-circuit the wmd ing in the motor circuit when thehrake is released.

2. lln brake controlling apparatus for elevators, the combination with the hoisting cluding the other of the said broke windings,

e switch in both the motor and shunt circuits to connect the said circuits to and disconnect them from the source of current supply, and a relay controlled jointly by the shovenamed switch and the brake to control a short-circuit around the series winding.

3. lln brake controlling epperetus for elevators, the combination with the hoisting motor, a brake therefor comprising a double Wound brake magnet, a source of current recipes supply, a motor circuit including one of the said brake windings in series therewith, a

' circuit in shunt to the said motor circuit, in-

ply, a relay winding having e current controlled jointly by the shove-named switch, and by the brake, and contacts actuated by the relay to control a short-circuit around the series Winding:

In testimony whereof, we have signed our names to this specification in the presence of two subscrib ng witnesses.

DAVID L; LINDQQUESTU I GEQRGE No Witnesses:

WALTER E. Honourin CHARLES Mnnvninn, 

